1812260809 has 16 divisors (see below), whose sum is σ = 1944628560. Its totient is φ = 1682841600.

The previous prime is 1812260783. The next prime is 1812260861. The reversal of 1812260809 is 9080622181.

It can be written as a sum of positive squares in 8 ways, for example, as 147865600 + 1664395209 = 12160^2 + 40797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1812260809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812260909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 908317 + ... + 910309.

It is an arithmetic number, because the mean of its divisors is an integer number (121539285).

Almost surely, 2^1812260809 is an apocalyptic number.

It is an amenable number.

1812260809 is a deficient number, since it is larger than the sum of its proper divisors (132367751).

1812260809 is a wasteful number, since it uses less digits than its factorization.

1812260809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1812260809 is about 42570.6566663001. The cubic root of 1812260809 is about 1219.1961041498.

The spelling of 1812260809 in words is "one billion, eight hundred twelve million, two hundred sixty thousand, eight hundred nine".